/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.wenzhoujie.zxing;

import java.util.Vector;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.Result;

/**
 * This class handles all the messaging which comprises the state machine for
 * capture.
 */
public final class CaptureActivityHandler extends Handler
{

	private static final String TAG = CaptureActivityHandler.class.getSimpleName();

	private final CaptureActivity activity;
	private final DecodeThread decodeThread;
	private State state;

	private enum State
	{
		PREVIEW, SUCCESS, DONE
	}

	public CaptureActivityHandler(CaptureActivity activity, Vector<BarcodeFormat> decodeFormats, String characterSet)
	{
		this.activity = activity;
		decodeThread = new DecodeThread(activity, decodeFormats, characterSet, new ViewfinderResultPointCallback(activity.getViewfinderView()));
		decodeThread.start();
		state = State.SUCCESS;
		// Start ourselves capturing previews and decoding.
		CameraManager.get().startPreview();
		restartPreviewAndDecode();
	}

	@Override
	public void handleMessage(Message message)
	{
		switch (message.what)
		{
		case Extras.AUTO_FOCUS:
			// Log.d(TAG, "Got auto-focus message");
			// When one auto focus pass finishes, start another. This is the
			// closest thing to
			// continuous AF. It does seem to hunt a bit, but I'm not sure what
			// else to do.
			if (state == State.PREVIEW)
			{
				CameraManager.get().requestAutoFocus(this, Extras.AUTO_FOCUS);// 实现聚焦
			}
			break;
		case Extras.RESTART_PREVIEW:
			Log.d(TAG, "Got restart preview message");
			restartPreviewAndDecode();
			break;
		case Extras.DECODE_SUCCEEDED:
			Log.d(TAG, "Got decode succeeded message");
			state = State.SUCCESS;
			Bundle bundle = message.getData();

			/***********************************************************************/
			Bitmap barcode = bundle == null ? null : (Bitmap) bundle.getParcelable(DecodeThread.BARCODE_BITMAP);// ���ñ����߳�

			activity.handleDecode((Result) message.obj, barcode);// ���ؽ��
			/***********************************************************************/
			break;
		case Extras.DECODE_FAILED:
			// We're decoding as fast as possible, so when one decode fails,
			// start another.
			state = State.PREVIEW;
			CameraManager.get().requestPreviewFrame(decodeThread.getHandler(), Extras.DECODE);// 实现拍照
			break;
		case Extras.RETURN_SCAN_RESULT:
			Log.d(TAG, "Got return scan result message");
			activity.setResult(Activity.RESULT_OK, (Intent) message.obj);
			activity.finish();
			break;
		case Extras.LAUNCH_PRODUCT_QUERY:
			Log.d(TAG, "Got product query message");
			String url = (String) message.obj;
			Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
			intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
			activity.startActivity(intent);
			break;
		}
	}

	public void quitSynchronously()
	{
		state = State.DONE;
		CameraManager.get().stopPreview();
		Message quit = Message.obtain(decodeThread.getHandler(), Extras.QUIT);
		quit.sendToTarget();
		try
		{
			decodeThread.join();
		} catch (InterruptedException e)
		{
			// continue
		}

		// Be absolutely sure we don't send any queued up messages
		removeMessages(Extras.DECODE_SUCCEEDED);
		removeMessages(Extras.DECODE_FAILED);
	}

	public void restartPreviewAndDecode()
	{
		if (state == State.SUCCESS)
		{
			state = State.PREVIEW;
			CameraManager.get().requestPreviewFrame(decodeThread.getHandler(), Extras.DECODE);
			CameraManager.get().requestAutoFocus(this, Extras.AUTO_FOCUS);
			activity.drawViewfinder();
		}
	}

}
